D23159: Prevent error() being emitted when purposefully reading 0 bytes

[Alexander Saoutkin]

feverfew created this revision.
feverfew added reviewers: dfaure, fvogt, chinmoyr.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
feverfew requested review of this revision.

REVISION SUMMARY
  Currently when 0 is passed as a parameter, if the file to be read is non-empty both data and error signals 
  are emitted. This behaviour is incorrect, as there is no error. This patch makes sure that only data is 
  emitted.

TEST PLAN
  The application I'm developing that hit this bug now no longer hits this issue.

REPOSITORY
  R241 KIO

BRANCH
  Read0Bug (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23159

AFFECTED FILES
  src/ioslaves/file/file.cpp

To: feverfew, dfaure, fvogt, chinmoyr
Cc: kfm-devel, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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